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01-07-2021, 11:03 AM | #1 |
Registered User
Join Date: Oct 2008
Location: Austin, TX
Posts: 72
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1978 k5, 3/4 ton caliper swap parts help
Working on a 1978 k5 i picked up recently and needs all the basic maintenance done. I was going to replace the calipers, rotors, and rubber lines. It has power disc brakes and a new master cylinder is on the way. I found the 3/4 ton upgrade and it seems worthwhile since i need to change the parts anyway but confused on what I need to buy.
What I found is 1985 Chevrolet C20 (3/4 Ton), 2wd, 5.7 engine Front Calipers for Heavy Duty brake system, 13" rear drums These require the 10mm banjo bolt and hose use 1985 C10 with the heavy duty brakes. So I am looking on napa now and want to verify im getting the right parts - napa total eclipse 3 5/32" piston calipers CAL SE4674 & CAL SE4673 - napa pads CAL SE4674 (should i use ebc ultimax 2's? cannot find the right part) - napa brake lines UP 38065 & UP 38066 - 2 banjo bolts for calipers Does this sound right? I already have the rotors for the stock 78 |
01-07-2021, 03:10 PM | #2 |
Senior Member
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,631
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Re: 1978 k5, 3/4 ton caliper swap parts help
You're not going to gain anything noticeable by swapping to a 3/4 caliper. In fact you may lose a little with the bigger piston
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01-07-2021, 03:36 PM | #3 | |
Registered User
Join Date: Oct 2008
Location: Austin, TX
Posts: 72
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Re: 1978 k5, 3/4 ton caliper swap parts help
Quote:
The only upside i saw was I could get them today at napa where my stock k5 calipers had to be ordered. |
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01-07-2021, 06:29 PM | #4 |
Senior Member
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,631
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Re: 1978 k5, 3/4 ton caliper swap parts help
Are you actually putting the 3/4 ton 14 bolt with the 13'' drums under the K5? and converting the front to 8 lug rotors? and additionally putting the 3/4 master cylinder on the existing booster
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02-09-2021, 03:48 PM | #5 |
Senior Member
Join Date: Mar 2016
Location: Longview, TX
Posts: 758
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Re: 1978 k5, 3/4 ton caliper swap parts help
More piston area = more clamping force. Made a big difference on my K5 with 35s. The guys at Offroad Design have been preaching this for year. It works.
Chappy: Go to RockAuto.com. Easier to see the part numbers I mention in the original post: http://67-72chevytrucks.com/vboard/s...d.php?t=777221 |
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